I was just wondering why I could go through the entire day thinking about one thing-say lucid dreaming, but when I dream my dreams involve tiny snippets of other ideas I might've had (literally fragments). Really does the subconsious mind base dreams on what is emotionally (something along these lines) envoked rather than the quantity of it?

If I know what attracts my subconsicious would it be possible to integrate ideas pretaining to lucid dreaming into this? Sort of like an effective reality check. Or is understanding the subconscious a bit of a stretch concerning how it takes the path of ideas?